JPH113816A - Electro-magnetic lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a electro-magnetic lock device wherein a moving iron core in a cold district or in a magnetic field it, extremely low temperature is prevented from frozen. SOLUTION: A lock device 1 comprises a main body case 2 and a fixed iron core 4 attached to the main body case 2. In the main body case 2, a magnetic coil body 8 to be formed as a hollow object is allocated, and on one side inside the magnetic coil body 8, an axis part 4a of the fixed iron core 4 is inserted and fixed, while on the other side, a moving iron core 10 which can move against the fixed iron core 4 is allocated. The fixed iron core 4 comprises a threaded hole attached to a to-be-attached member, while a tapered female part 4b is formed inside the axis part 4a. The moving iron core 10 is provided with a slide part 10a and a tapered male part 10b to be engaged with the female part 4b of the fixed iron core 4, and attached to the fixed iron core 4 through an excited magnetic coil 7 of the magnetic coil body 8. The moving iron core 10 is attracted for a current to continue to flow while the slide part 10a protruding outside the fixed iron core 4, with the moving iron core 10 accumulating heat. Thus, the moving iron core 10 does not freeze even under a cold environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic locking device having a movable iron core which is attracted to a fixed iron core by exciting a coil, wherein a locking action is performed by projecting a tip of the movable iron core out of a main body. More particularly, the present invention relates to an electromagnetic lock device configured to prevent freezing of a movable iron core.

[0002]

2. Description of the Related Art Generally, an electromagnet includes a fixed core and a movable core. When a coil wound on a bobbin is energized, a magnetic field is generated between the fixed core and the movable core, and the movable core is attracted to the fixed core. Actuated as follows. The movable iron core to be operated is applied to various applications by rotating or linearly sliding. For example, if a valve is connected to the tip of a movable iron core that slides linearly, an electromagnetic valve is configured. Also, if the linear forward and backward movement of the movable iron core is used as it is, a pallet in a multi-story parking lot It is applied to the lock device for the fall prevention and the door lock device.

Conventionally, a lock device 40 for preventing a pallet from dropping in a multi-story parking lot is provided with an automobile mounted below when a pallet suspended and supported by a chain or the like falls due to, for example, a broken chain. Not to damage the
It is provided to support the dropped pallet, and as shown in FIG. 6, a magnetic coil 44 wound around a hollow bobbin 42, a movable iron core 46, a spring 48,
A disk-shaped stopper 50 for supporting the spring 48; and an iron ring 52 for filling the space between the stopper 50 and the bobbin 42.
And an iron case 54 for housing the magnetic coil 44, a solenoid is formed, and a pallet can be supported by a part of a movable iron core 46 protruding from a bearing portion 56 of the case 54. In addition, the movable core 4
A reed switch 58 that is turned on in response to the magnetism when 6 is attracted to a predetermined position is attached.

The lock device 40 is mounted on a column such as a multistory parking garage, and the movable iron core 46 protrudes to dispose the lower surface of the pallet on which the automobile is mounted so that the lower surface of the pallet can be supported. I was

[0005]

However, in the conventional lock device, when the multi-story parking lot is not moving, the magnetic coil 44 is not normally energized and the movable iron core 46 projects outside the case 54. When the multi-story parking lot is movable, the magnetic coil 44 is energized to move the movable iron core 46 into the case 54. Therefore, when used on a cold day, especially in a cold region, the movable core freezes, and even when the movable core does not move even when the magnetic coil is excited, or when the excitation of the magnetic coil is released, the movable core is movable. There is a possibility that the iron core does not project to a predetermined position. If the movable iron core 46 is frozen and does not move, the multistory parking lot device cannot be moved.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an electromagnetic lock device capable of reliably operating a movable iron core by preventing freezing of the movable iron core.

[0007]

An electromagnetic lock device according to the present invention is configured as follows to solve the above-mentioned problems. That is, the fixed core is provided with a fixed core disposed in the coil body formed in a hollow shape, and a movable core disposed slidably so as to approach and separate from the fixed core. A tapered female portion is formed on the movable core side so as to be attachable to the attached member, and the movable core forms a tapered male portion engageable with the female portion of the fixed core. In addition, the movable core is attracted and moved to the fixed core by excitation of the coil of the coil body, and a distal end portion of the movable core is configured to protrude outward through the fixed core,
When the tip of the movable iron core projects outward, a current flows through the coil.

Preferably, a DC current always flows through the coil in a state where the tip of the movable iron core projects outward.

Further, a DC current may flow through the coil when the movable core is attracted and moved, and the coil may be switched to an AC current after the movable core is attracted.

[0010] More preferably, a sensor for detecting that the movable iron core has attracted and moved is disposed in the main body, and when the sensor is turned on, a signal for switching from a direct current to an alternating current is output to the coil. What is necessary is just to be the thing characterized by that.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

An electromagnetic lock device (hereinafter referred to as a lock device) 1 of the present embodiment is a stepped and substantially cylindrical main body case 2.
And a fixed iron core 4 attached to the main body case 2 with bolts to form a shaft portion 4a.

A magnetic coil body 8 having a hollow bobbin 6 and a magnetic coil 7 wound around the bobbin 6 is provided in the main body case 2, and a yoke for forming a magnetic field around the magnetic coil body 8. 9 are provided. Further, the shaft of the fixed core 4 is fitted and fixed to one side of the inner peripheral surface of the bobbin 6, and the movable core 10 is slidably disposed on the other side so as to approach and separate from the fixed core 4. ing.

The fixed iron core 4 has a tapered female portion 4b formed to have a small diameter inward from the end face of the shaft portion 4a to adsorb the movable iron core, and has a flange portion 5 attached to a member to be attached. It also serves as a bracket. A sliding guide hole 4c through which the movable core 10 slides is formed around the axis of the fixed iron core, and a dry bearing 4d and a scraper 4e are fitted into the sliding guide hole 4c. Further, the flange portion 5 is formed with a predetermined number of screw holes 13 through which the lock device 1 is attached to the member to be attached.

On the other hand, the movable iron core 10 is inserted into the sliding guide hole 4c of the fixed iron core 4, and the sliding portion 10a slidably fitted to the dry bearing 4d and the scraper 4e. A coil spring 1 hooked on the main body case 2 is formed in a concave portion formed in a rear end surface in which a tapered male portion 10b engageable with the female portion 4b and a large diameter portion 10c are formed.
5 is attached to the movable core 10 so as to urge the movable core 10 in a direction away from the fixed core 4. In addition, a spacer 17 for preventing residual magnetism generated when the attracted movable core 10 separates is disposed at the base of the sliding portion 10a of the movable iron core 10.

The tip (left end in FIG. 1) surface of the sliding portion 10a is
When the movable core 10 is attracted by the excitation of the magnetic coil 7 and is moved to the left, the movable core 10 protrudes outward beyond the distal end surface of the fixed core 4 (see FIG. 1), and the excitation of the magnetic core 7 is released. As shown in FIG. 2, when it is moved to the right side, it is configured to enter the inside of the fixed iron core 4 slightly from the tip (left end in FIG. 2) surface of the sliding guide hole 4c.

The large-diameter portion 10c of the movable iron core 10 is formed in a stepped shape, and is formed in a tapered shape so that the stepped portion 10d comes into contact with the roller 19a of the microswitch 19 disposed in the main body case 2. When the movable core 10 is slid to the left in order to attract the movable core 10 to the fixed core 4, the step 10 d of the movable core 10
To confirm the position of the movable iron core 10.

In the lock device 1 configured as described above, the current flowing to excite the magnetic coil 7 is the first type in which a DC current is always supplied, and the DC current is supplied in order to attract the movable core 10. After that, it can be performed in two modes, the second mode in which the current is switched to the alternating current and the current is continued to flow until a command is issued. The electric circuit in each case will be described below.

The electric circuit according to the first embodiment is configured to apply an AC current of 200 V AC to the magnetic coil 7 through the relay contact 20 and the full-wave rectifier circuit 25, as shown in FIG. I have. Therefore, in order to attract the movable iron core 10 to the fixed iron core 4, by turning on the relay contact 20, a direct current always flows through the magnetic coil 7.

As shown in FIG. 4, the electric circuit according to the second embodiment is applied to a power system that applies an AC current of 200 V AC to the magnetic coil 7 via a relay contact 20 and a full-wave rectifier circuit 25. Relay contact 20 for coil 7
A via the relay contact 21 and the transformer circuit 26 of the pair
The power supply system is configured to apply a C200V AC current. Then, in order to attract the movable core 10 to the fixed core 4, the relay contact 20 is turned on and a DC current is passed, and then the relay contact 20 is turned off by a switch or a timer, and simultaneously the relay contact 21 is turned on. An alternating current flows through the magnetic coil 7 while being attracted. At this time, if the alternating current continues to flow for a long time with the voltage of 200 V AC, the temperature becomes too high and the magnetic coil 7 may be burned.
The voltage is reduced by the transformer circuit 26 to such an extent that the adsorption of 0 is not released.

The locking device 1 configured as described above
For example, as shown in FIG. 5, it is used to prevent a pallet from falling in a multistory parking lot (hereinafter referred to as a parking lot) P. This multi-story parking garage P is provided with a car C mounted on a pallet PL,
It is moved up and down by a chain suspended on the pallet PL in the elevating device and stored in a predetermined place. The fixed iron core 4 of the lock device M1 is engaged at the same height with the two posts S of the four posts S in the lifting device through which the pallet PL passes, and a bolt is screwed into the screw hole 13. Thus, the lock device 1 is fixed to the column S.

When the pallet PL on which the automobile G is mounted does not move in the vertical direction, the movable iron core 10 is always operated so as to protrude from the column S toward the inside of the elevating device (FIG. 1). 5, two-dot chain line). Even if a chain break occurs, the pallet PL can be
Can be locked, without damaging the vehicle below.

In this state, in the case of the current flow in the first embodiment, when a DC current is applied to the magnetic coil 7 to attract the movable core 10, the fixed core 4 and the movable core 10 are connected via the yoke 9. A magnetic field is generated between the movable iron core 10
Is moved against the urging force of the coil spring 15, and the DC current continues to flow even thereafter. At this time, the DC current flowing through the magnetic coil 7 causes the magnetic coil 7 to generate heat, and conducts the heat from the magnetic coil 7 to the movable core 10 via the bobbin 6. The heat conducted to the movable core 10 is transmitted to the sliding portion 10a of the movable core 10, and is always maintained at a temperature higher than the outside air temperature. For this reason, even when the surface of the movable core 10 (particularly the sliding portion 10a) freezes due to severe winter cold or use in a cold region, the surface of the movable core 10 freezes with heat. Nothing. Although the DC current itself does not generate much heat to the movable core 10, the heat generated by flowing the current for a long period of time is, for example, even when the sliding portion 10 a of the movable core 10 is cold such that it freezes. It does not reach the point where the iron core 10 is frozen.

In the case of the current flow in the second embodiment, a DC current is applied to the magnetic coil 7 to attract the movable core 10 to generate a magnetic field, and the movable core 10 is moved. Step 10d is a micro switch 19
When the micro switch 19 is actuated by pressing the roller 19a, an AC current lower than AC 200 V is switched and flows through the magnetic coil 7, and thereafter the AC current continues to flow. Generally, when an AC current is passed through a DC solenoid,
The movable iron core generates self-heating due to iron loss due to the AC magnetic field,
Since freezing and thawing can be easily performed, a predetermined alternating current is applied to the magnetic coil 7 to help prevent the movable iron core 10 from freezing. In this case, the magnetic coil 7
It is desirable to control the temperature with a thermistor in order to prevent burnout.

Next, when the pallet PL is moved up and down in order to put the car C in and out, the magnetic coil 7
Release the excitation. Then, the fixed core 4 and the movable core 10
The movable magnetic core 10 is separated from the fixed iron core 4 by the urging force of the coil spring 15 (solid line in FIG. 5). At this time, since the movable core 10 is not frozen at a temperature higher than the outside temperature, the movable core 10 is immediately returned.

When the micro switch 194 is turned off,
The pallet PL is moved up and down to replace the car. At this time, since the movable iron core 10 of the lock device 1 does not hinder the vertical movement of the pallet PL, the vertical movement of the pallet PL is operated without any problem. Even if the energization of the magnetic coil 7 is released and the movable core 10 does not generate heat, the heat generation of the movable core 10 is not suddenly reduced because the multi-story parking lot is operated for a short period of time. Further heat is generated by energization.

Experiments have shown that the shape of the tapered female portion 10b of the movable iron core 10 of the present embodiment is advantageously formed to improve the magnetic force and increase the attraction force. That is, since the thickness of the male portion 10b of the movable core 10 increases as it is attracted to the fixed core 4, the magnetic flux density gradually increases in the direction in which it is attracted, and the magnetic force is improved.

As described above, when the movable core 10 protrudes into the column S of the elevating device, a current always flows and the temperature of the movable core 10 itself can be increased.

This lock device can be used not only in a multi-story parking lot but also as a door lock device or other lock devices, for example.

[0030]

According to the present invention, the electromagnetic lock device is
A fixed iron core disposed in a hollow coil body;
A movable core slidably disposed so as to approach and separate from the fixed core, wherein the fixed core is formed so as to be attachable to a member to be mounted, and is tapered toward the movable core side. Shaped female part is formed, and the movable iron core is
While forming a tapered male portion engageable with the female portion of the fixed core, the movable core is attracted to the fixed core by excitation of the coil of the coil body, and the tip of the movable core is moved. It is configured to protrude outward through the fixed iron core. Then, current flows through the coil in a state where the tip of the movable core projects outside the main body case, so that the movable core is not always warmed and does not freeze. Therefore, it can greatly help to prevent freezing when used in a cold winter season or in a cold region.

Further, if a DC current always flows through the coil in a state where the tip of the movable core projects outward, the movable core can be efficiently heated by long-term heat generation. , Can prevent freezing.

Also, a direct current flows through the coil when the movable core is attracted and moved, and is switched to an alternating current after the movable core is attracted, so that the movable core can be surely warmed. This can prevent the movable core from freezing.

Further, a sensor for detecting that the movable iron core has moved by suction is disposed in the main body, and a signal for switching from a DC current to an AC current is output to the coil when the sensor is turned on. As a feature,
The current can be switched in accordance with the timing at which the movable core is attracted and moved, and the movable core can be reliably heated.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a suction state of a lock device according to a first embodiment of the present invention;

FIG. 2 is a front sectional view showing a non-sucking state of the lock device in FIG. 1;

FIG. 3 is a circuit diagram showing a first embodiment in FIG.

FIG. 4 is a circuit diagram showing a second embodiment in FIG.

FIG. 5 is a diagram showing the operation of one embodiment of the lock device in FIG. 1;

FIG. 6 is a sectional view showing a conventional lock device.

[Description of Signs] 1 ... Locking device 2 ... Main body case 4 ... Fixed iron core 4a ... Shaft portion 4b ... Female portion 6 ... Bobbin 7 ... Magnetic coil 8 ... Magnetic coil body 10 ... Movable iron core 10a ... Sliding portion 10b ... Male portion 15 ... Coil spring 19 ... Micro switch (sensor)

Claims (4)

[Claims] A fixed core disposed in a hollow coil body; and a movable core slidably disposed so as to approach and separate from the fixed core. A fixed core is formed so as to be attachable to the member to be attached, and a tapered female portion is formed on the movable core side, and the movable core is capable of engaging with the female portion of the fixed core. And the movable core is attracted to the fixed core by the excitation of the coil of the coil body, and the distal end of the movable core projects outward through the fixed core. An electromagnetic lock device wherein current flows through the coil when the tip of the movable iron core projects outward. 2. The electromagnetic lock device according to claim 1, wherein a direct current always flows through the coil in a state in which a tip end of the movable iron core projects outward. 3. The electromagnetic lock device according to claim 1, wherein a DC current flows through the coil when the movable core is attracted and moved, and is switched to an AC current after the movable core is attracted. 4. A sensor for detecting that the movable iron core has moved by suction is disposed in the main body, and a signal for switching from a DC current to an AC current is output to the coil when the sensor is turned on. The electromagnetic locking device according to claim 3, wherein: